Brodtkorbite Mineral Data

Brodtkorbite Mineral Data

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General Brodtkorbite Information

Chemical Formula:

Cu2HgSe2

Composition:

Molecular Weight = 485.60 gm

Copper 26.17 % Cu

Mercury 41.31 % Hg

Selenium 32.52 % Se

______

100.00 %

Empirical Formula:

Cu₂HgSe₂

Environment:

Telethermal selenide vein-type assemblage. Possibly related to Ag2HgS2 (Imiterite)

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Tuminico, Bajo Jugüe, Sierra de Cacho, Sierra de Umango, La Rioja, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for Milka Kronegold de Brodtkorb (1932-), Professor at the University of Buenos Aries and La Plata, Argentina

Synonym:

IMA1999-023

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Brodtkorbite Crystallography

Axial Ratios:

a:b:c =1.7936:1:1.733

Cell Dimensions:

a = 7.492, b = 4.177, c = 7.239, Z = 2; beta = 114.2° V = 206.63 Den(Calc)= 7.80

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.73(1)(112), 2.223(0.7)(211), 3.991(0.7)(101),2.072(0.5)(113,312), 3.414(0.5)(200), 3.534(0.5)(011), 3.576(0.5)(110),

Physical Properties of Brodtkorbite

Cleavage:

None

Color:

Dark gray.

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Streak:

dark gray

Optical Properties of Brodtkorbite

RL Anisotrophism:

Weak to strong.

RL Bireflectance:

Strong.

RL Color:

White.

RL Pleochroism:

Weak to moderate.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Brodtkorbite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	29.60	37.10
546 nm	27.40	35.10
589 nm	26.60	34.60
650 nm	26.10	34.10

**Standardized Intensity (100%) Reflection Spectra of Brodtkorbite in Oil**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	15.15	22.00
546 nm	13.30	20.15
589 nm	12.70	19.80
650 nm	12.30	19.25

**Calculated Relative Intensity Colors of Brodtkorbite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	330%
R₁
R₂

**Calculated Relative Intensity Colors of Brodtkorbite in Oil**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	700%
R₁
R₂

Calculated Properties of Brodtkorbite

Electron Density:

r_electron=6.62 gm/cc
note: r_Brodtkorbite=7.80 gm/cc.

Fermion Index

Fermion Index = 0.14946
Boson Index = 0.85054

Photoelectric:

PE_Brodtkorbite= 728.96 barns/electron
U=PE_Brodtkorbite x r_electron=4,824.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brodtkorbite is Not Radioactive

Brodtkorbite Classification

Dana Class:

2.5.8.2 (2)Sulfides - Including Selenides and Tellurides

(2.5)where Am Bn Xp, with (m+n):p=3:2

(2.5.8)Dana Group

2.5.8.1 Imiterite Ag2HgS2 P 2₁/c 2/m

2.5.8.2 Brodtkorbite ! Cu2HgSe2 P 2₁/n 2/m

Strunz Class:

II/B.06-55 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold

II/B.06 - Jalpaite - Imiterite series

II/B.06-10 Jalpaite Ag3CuS2 I 4₁/amd 4/m 2/m 2/m

II/B.06-20 Mckinstryite (Ag,Cu)2S Pnam 2/m 2/m 2/m

II/B.06-30 Stromeyerite AgCuS C mcm 2/m 2/m 2/m

II/B.06-40 Eucairite CuAgSe Pmmn 2/m 2/m 2/m

II/B.06-50 Henryite Cu4Ag3Te4 Unk Cubic

II/B.06-55 Brodtkorbite Cu2HgSe2 P 2₁/n 2/m

II/B.06-60 Imiterite Ag2HgS2 P 2₁/c 2/m

Other Brodtkorbite Information

References:

NAME( MinRec, vol 34, p 203) PHYS. PROP.(MinRec, vol 34, p 203) OPTIC PROP.(MinRec, vol 34, p 203)

See Also:

Links to other databases for Brodtkorbite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Brodtkorbite Specimen Label here :

Brodtkorbite

Cu2HgSe2
Dana No: 2.5.8.2 Strunz No: II/B.06-55
Locality:

Notes: